Internet keeps switching between WiFi and LAN for no apparent reason.

I am using a ASUS laptop with Win 8.1
Have and ADSL2+ connection via phone line
Modem: EdiMax with wireless and 4 LAN ports

When Laptop is plugged into LAN, after some time laptop reports internet not available, as soon as I pull out LAN cable from laptop WiFi activates and Internet is now available on laptop. After a short time laptop indicates No Internet available, so I plug in LAN cable and we have internet again. This backwards and forwards process is done many times a day and is getting annoying.

The wifi being used is the same modem, not from another device. Modem is within 5 metres of laptop.

Any suggestions as to what is causing this issue would be appreciated.
AIGSNetwork AdministratorAsked:
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JohnBusiness Consultant (Owner)Commented:
1. in the existing setup, run TCP/IP Refresh and DNS Flush.

Open cmd.exe with Run as Administrator
Then  netsh int ip reset c:\resetlog.txt
Also, ipconfig /flushdns followed by net stop dnscache followed by net start dnscache
Then restart the computer

2. Try the laptop in a completely different setup.

The switching is NOT normal and has never happened on its own on my Windows 8.1 laptop.
AIGSNetwork AdministratorAuthor Commented:
Thanks John - I have done what you have suggested - I will see how the day goes and if the issue is resolved.
Note (sorry I didn't mention): When my wife is on her laptop (wireless) only and connected - when I loose connection, she does also until I carry out the plugging and unplugging of LAN on my laptop.
JohnBusiness Consultant (Owner)Commented:
I would do a hard reset on the modern or get the ISP to replace it. TWO laptops doing the very same thing condemns the modem (since the LAN connections are also failing) . You should also try upgrading the firmware on the modem.

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AkinsdNetwork AdministratorCommented:
If this is affecting multiple users, you may want to check the router.

Try rebooting the router and see if any difference.
A reset may be necessary on the router also
JohnBusiness Consultant (Owner)Commented:
I think there is no router, only a modem if I understand the first post correctly.
AkinsdNetwork AdministratorCommented:
In that case, the modem is also the router, which may need to be rebooted or reset
JohnBusiness Consultant (Owner)Commented:
I already covered that in my post above.
AkinsdNetwork AdministratorCommented:
No worries
We probably were both typing at the same time but you submitted your post 2 minutes before mine.
JohnBusiness Consultant (Owner)Commented:
Another possibility that exists is that the modem is not compatible to the Windows 8 network card. I have had router / network card incompatibilities before.

Is this your modem ? or the ISP modem ?  Either way, consider a different modem altogether.

You can also put the modem into bridge mode and attach a good modern router. Now connect through the router.
MacleanSystem EngineerCommented:
Check the DHCP settings on the router. Sounds like you might have an IP conflict.
Broaden the range to ensure you can accommodate sufficient devices.
AIGSNetwork AdministratorAuthor Commented:
Upgrading the firmware worked fine - thanks.
JohnBusiness Consultant (Owner)Commented:
@AIGS - Thanks for the update and I was happy to help.
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